Rotary Bored Piling Specialists

Reinforcement Positional Problems

Reinforcement which is located incorrectly from its designed position may affect the compressive, flexural and tensile capacity of the pile. (See reinforcement cage installation)

Primary Reason

The piling circumstances prevent the accurate positioning of the reinforcement.

Possible Causes

Unable to place a reinforcement cage into the concrete of a CFA pile following the loss of concrete workability; caused by excess hydraulic pressure in the concrete resulting in fluid loss to the ground.

Reinforcement cage sinks during casing extraction

Reinforcement cage lifts during Tremie operation through upward flow of concrete

Reinforcement laterally displaced in fluid concrete

Likely Scenarios
Possible Causes

Unable to place a reinforcement cage into the concrete of a CFA pile following the loss of concrete workability; caused by excess hydraulic pressure in the concrete resulting in fluid loss to the ground.

Likely Scenario
  • A poorly designed concrete mix may have an apparent high workability by virtue of excess water, but loses this if the ground is able to absorb it.
  • The scenario may be improved by a mix design that has low bleed characteristics.
(See concrete for piling)
Possible Causes

Reinforcement cage sinks during casing extraction

Likely Scenario
  • The downward movement of concrete during casing extraction may cause an unsupported cage to sink.
  • The situation is exacerbated by casing lengths in excess of reinforcement cage lengths.
  • The concrete between the cage and the casing stiffens, by loss of water through casing joints or premature concrete set. Increased friction with concrete lifts cage.
Possible Causes

Reinforcement cage lifts during Tremie operation through upward flow of concrete

Likely Scenario

Tremie pipe embedment into concrete is too great, scenario may be avoided through regular splitting of tremies.

Possible Causes

Reinforcement laterally displaced in fluid concrete

Likely Scenario

Insufficient spacers to prevent displacement

Get In Touch


For more information about our services and how we can help you with your projects, please call us on 01476 570781 or leave us a message below.